The xf86-video-vmware- and xf86-input-vmmouse packages / ports enable VMware users to automatically have a functional desktop when installing the xorg package.
The xf86-video-vmware driver is one of the hardcoded Xserver drivers that are tried at Xserver start, and it backs off if not run on a VMware platform.
Autodetection support for vmmouse+devd has just been filed as a bug. Meanwhile there should be no harm in including it in the Xorg port.
Almost no drivers are included in the default install of x11-drivers, see list below.
kbd_drv.so : x11-drivers/xf86-input-keyboard
mouse_drv.so : x11-drivers/xf86-input-mouse
scfb_drv.so : x11-drivers/xf86-video-scfb
vesa_drv.so : x11-drivers/xf86-video-vesa
I'm not sure I want to include this driver, since it's easy to install separately, and adding it would clutter up installs for all non VMWare use cases. I have to think this over some.